Juncus marginatus

Rostkovius

de Junco 38, plate 2, fig. 3. 1801.

Common names: Grass-leaf rush
Illustrated
Synonyms: Juncus aristulatus Michaux Juncus aristulatus var. pinetorum Coville Juncus biflorus Fernald Juncus longii (Torrey) Steudel Juncus marginatus var. aristulatus (Michaux) Coville Juncus marginatus var. biflorus (Elliott.) Chapman Juncus marginatus var. odoratus Torrey Juncus marginatus var. paucicapitatus Engelmann Juncus marginatus var. setosus Coville Juncus marginatus var. vulgaris Engelmann Juncus odoratus Juncus setosus
Treatment appears in FNA Volume 22.

Herbs, perennial, occasionally tufted, sometimes rhizomatous, 3–13 dm. Rhizomes short, knotty. Culms compressed. Leaves basal and cauline; auricles 0.5–1.5 mm, apex rounded, membranous; basal blade flat, 20–4.5 dcm × 1.5–5 mm, cauline reduced. Inflorescences glomerules, (2–) 5–200, each with (1–) 2–10 (–20) flowers, mostly open, 3–10 (–15) cm; primary bract shorter than inflorescence. Flowers: tepals dark brownish, usually with green midstripe, outer series ovatelanceolate, 1.8–3.2 mm, margins broad, clear, awned or not, apex acutish; inner series ovate to lanceolate, 2–3.5 mm, slightly longer than outer series, apex obtuse to acute, awned or not; stamens 3, opposite outer tepals, shorter to longer than tepals, filaments 1.1–2.5 mm, anthers 0.3–1.2 mm; style 0.3 mm. Capsules brown and sometimes dark spotted, 3-locular, obovoid to nearly globose, 1.8–2.9 mm, shorter to longer than perianth. Seeds yellow to light-brown, fusiform, 0.4–0.7 mm, not tailed. 2n = 38, 40.


Phenology: Flowering and fruiting late spring–fall.
Habitat: Moist to wet sandy, peaty, or clayey soils, usually in open areas including bogs, shores, marshes, and ditches

Distribution

V22 497-distribution-map.jpg

N.S., Ont., Ala., Ariz., Ark., Calif., Colo., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.H., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Vt., Va., W.Va., Wis., Mexico, West Indies (Cuba), Central America

Discussion

The number of glomerules per inflorescence, stamen length vs.versus perianth length, and tepal shape have separately and in combination been used to distinguish a number of taxa at various nomenclaturalorial ranks. These characters, however, vary considerably across the distribution of the species (broad sense) and do so independently of one another to the point that if separate taxa are recognized, they pass insensibly among each other.

Selected References

None.

Lower Taxa

None.
... more about "Juncus marginatus"
persistent +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
obtuse +  and acute +
membranous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Ralph E. Brooks* +  and Steven E. Clemants* +
Rostkovius +
channeled;terete;flat +
brown and sometimes dark spotted +
obovoid;nearly globose +
shorter to longer +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.29 cm2.9 mm <br />0.0029 m <br />) +
Grass-leaf rush +
compressed +
N.S. +, Ont. +, Ala. +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Vt. +, Va. +, W.Va. +, Wis. +, Mexico +, West Indies (Cuba) +  and Central America +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
arranged +  and cluster +
headlike +
Moist to wet sandy, peaty, or clayey soils, usually in open areas including bogs, shores, marshes, and ditches +
pseudoaxillary +  and terminal +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
ovate +  and lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
cauline +  and basal +
3 +  and 1 +
ovatelanceolate +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
shorter to longer +
green;brown or purplish black +
persistent +
Flowering and fruiting late spring–fall. +
parietal +  and axile +
yellow +  and light-brown +
not tailed;fusiform +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
green;brown or purplish black +
persistent +
Illustrated +
generally longer +
0.3 cm3 mm <br />0.003 m <br /> (?) +
Juncus aristulatus +, Juncus aristulatus var. pinetorum +, Juncus biflorus +, Juncus longii +, Juncus marginatus var. aristulatus +, Juncus marginatus var. biflorus +, Juncus marginatus var. odoratus +, Juncus marginatus var. paucicapitatus +, Juncus marginatus var. setosus +, Juncus marginatus var. vulgaris +, Juncus odoratus +  and Juncus setosus +
Juncus marginatus +
Juncus subg. Graminifolii +
species +
dark brownish +